The daylight purchase brief is a comparison worksheet proposed here. It starts with a task and separates required features from attractive extras, using fictional products to demonstrate the method.
01Complete the brief before browsing
Write five fields: activity, must-fit dimensions, carrying limit, storage conditions and evidence still needed. Then list optional features in a separate space. For a fictional balcony reading setup, the activity is sitting with a book, the available storage opening is forty centimetres wide, and the owner wants an item that can be carried in one trip. The brief does not decide what to buy. It establishes which facts must be checked before a product belongs in the comparison, reducing the temptation to treat attractive photographs as evidence of suitability.
02Compare two fictional stools
Imagine Stool A has a stated folded width of thirty-five centimetres and Stool B forty-five centimetres. Both are fictional entries, and neither has been physically tested here. Under the forty-centimetre storage constraint, A remains a candidate while B does not fit the stated opening. A still needs a depth measurement, carrying weight and relevant product-use information before a decision. This is a constraint comparison, not a recommendation. An appealing optional feature on B does not resolve the missing five centimetres of storage clearance.
03Retain the unknowns
Finish the worksheet with a short list of questions that could change the outcome. In the stool example, the opening might be measured incorrectly, the folded shape might require rotation, or the stated dimension might omit a protruding part. Recheck the physical space and consult the complete product dimensions before treating the comparison as resolved. Keep the original values and any later correction visible. A useful shopping note can end with an unanswered question; making uncertainty explicit is more helpful than declaring a winner from incomplete information. Date the worksheet so a later reader can distinguish the original comparison from a newly revised specification.
